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June 27, 1933. O c SCHROEDER ET AL 1,915,903

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' HEATER Filed Feb. 25, 1932 3 Sheets-Sheet 3 fittornegm Patented June 27, 1933 UNITED STATES PATENT OFFICE OSCAR C. SCHROEDER, AND STANLEY PERRY, OF CHICAGO, ILLINOIS; SAID PERRY ASSIGNOR TO AUTOMATIC BURNER CORPORATION, OF CHICAGO, ILLINOIS, A COR- IOBATION OF ILLINOIS HEATER Application filed February 25, 1932. Serial No. 595,178.

Our invention relates more particularly, though as to certain features thereof not exclusively, to oil heaters of the type employing an air duct, rising through the casing of the heater for heating airv entering the lower portion of the heater and discharging it at the upper portion thereof.

Certain of my ob'ects are to provide a heater of the type above referred to which will be of simple construction and by whlch the heat generated in the combustion chamber of the heater may be used to the best advantage in the heating of the air circulating in the air duct; to provide for the minimum resistance to the flow of air through the heater; to provide for a long gas passage through the heater with the minimum resistance to the flow of the gas therethrough to the endof providing, in connection with the air duct, for the absorption by the air, in the flue, of the heat in the gases to a high degree thus assuring low stack temperatures; to provide I for the supporting of the burner unit, valve mechanism therefor, fire box structure and exterior shell, when used, on a base and in their proper relation, and for the adjustment on the base to cause these parts to occupy the desired position in use; to provide means for air-coollng the valve mechanism referred to and pre-heating the air supplied for supporting combustion; to providea structure which will serve the double purpose of catching any drippings'from a burner, where an oil burner is used and forming the bottom of the combustion chamber; to provide a construction of heater having an air duct, the casing and duct portions of which will present the minimum number of joints; to render such structures more economical of manufacture and better adapted to perform the service for which they are provided; and other objects.

as will be manifest from the following description.

Referring to the accompanying drawin s:

Figure 1' is a view in vertical sectional e evation of an oil-burner heater constructed in accordance with my invention, the section being taken at the line 1,-1 on Fig. 3 and viewed in the direction of the arrows.

Figure 2 is a perspective view of a-sheet 4-4 on Fig. 1 and viewed in the direction of the arrow; and

Figure 5,a plan section taken at the line 5-5 on Fig. 1 and viewed in the direction of the, arrows.

The heater shown comprises a base portion 6 having legs 7 at which the heater is supported, an outer shell 8 forming a casing shown as of rectangular shape in plan, a

perforated hood, or cover portion, 9 surmounting the shell 8, a burner apparatus 10, shown as an oil burner, for generating the heat, and an inner shell structure 11 disposed in the shell 8 and spaced therefrom at all sides and at its top and forming air and gas ducts or flues.

The base 6 which may be in the form of a casting com rises a plate portion 12 having depending anges 13 along each edge there of which is lapped by the lower edges of the shell 8 with which the base is telescoped and to which it is attached by screws 14, the lower edge of the shell 8 having applied thereto angle irons 15 secured in place the screws 14, the horizontal flanges 16 o the angle irons 15 extendin inwardly.

The base 6 is provide at its four corners with outwardly extending arms 17 to which the le 7 are secured as hereinafter describe and is provided at its back and side edges and at portions of its front edges with an upstanding rib 18 and within the rib 18 as provided, with u standing continuous ribs 19 and 20 located orward of the rear edge of the base 6 and surroundin openings 21 and 22, respectively, in the ase, the rib structures 19 and 20 extending short of the ribs 18 at the side edges of the base.

' aperture 26.

The burner apparatus 10 is supported on the plate 24 of the base 6, the plate 24 being of skeleton form as shown. The burner apparatus 24 in the particular construction shown comprises two burner units 27 of the well known range burner type and comprising inner and outer perforated shells 28 and 29, the piping represented at 30 and through which the oil is supplied to the units 27 be- =ing provided with oil-flow-controlling valve devices 31, the stems 32 of which extend through the front side of the heater to be accessible for manipulation, the pipe to which the oil is supplied to the valve-controlled piping 30, being represented at 33 and extending to any suitable source of oil supply, as for example oil-supplying apparatus including an oil-receptacle (not shown), the oil-supplying apparatus being preferably supported exteriorly of the heater-casing on the rear end of a bracket 6 secured to the base 6.

The base 6, together with an oil drip pan 34 located directly below the burner apparatus, forms the bottom of the heater, the pan 34 being shown as supported at its front edge on the flange 16 at the front and at its rear edge on an arm 35 pivotally supported at 36 on the base 6, the pan 34 thus being adapted for removal as desired. The front wall of the shell 8 contains anopening 37 for a door casing 38 and door 39 co-operatin therewith, and a damperequipped air-inlet structure 40, the o ening- J 37 being framed by an upper channe cross member 41, a lower channel cross member 42 and side channel members 43, the latter extending to the base 6.

The door casing 38 fits into the opening between the cross channels 41 and 42 and is secured in place in any desirable manner, the door 39 being hinged to the door frame at the hinges represented at '44.

The structure 40 comprises a stationary plate section 45 secured in place and containing air-inlet openings 46 and a damper in the form of a sliding plate 47 containing apertures 48 for controlling the passage of air at this point into the heater.

The opening 41 below the structure 40 is closed bythe member 49 and a plate 50 which are secured at their ends to theside channels 43.

Positioned back of the air-inlet structure 40 and spaced therefrom is a vertical bae plate 51 secured at its upper edge to the cross of the heaterv channel 42 and extending to within a short distance of the portion12 of the base 6, this plate being secured to the forward edge of the upper plate portion 24 of the base and extending the full width of the opening 37.

The upperedges of the shell 8 are stiffened by turning these edges inwardly and then downwardly as represented at 52 thereby causing the shell to present a framing about its upper edge into which the depending flanged portion 53 of the cover 9 extends.

The inner shell 11 is formed of a front plate portion 54, side plate portions 55, a back portion 56, and a top portion 57, the front portion 54 being closed except for an opening 58 coincident, and coextensive, with the opening 37 in the outer shell.

The shell 11 thus provided affords, with the outer shell 8, air passages 59 at opposite sides of the heater, an air passage or flue 60 at the back of the heater and an air passage or flue 61 at the front of the heater the front wall of which contains louvered inlets 62. The passages 59 and 60 open at their bottoms to theatmosphere through the openings in the base 6 and, together with the flue 61, open at their upper ends into the space above the top 57 of the inner shell and thus in communication with the apertured top portion 9 of the heater.

The shell 11 also comprises a sheet metal structure (Fig. 2), preferably provided as a unit, and comprising a duct 63 of rectangular shape in plan section and open at its top and bottom, the duct 63 being provided along its forward vertical edges with laterally extending plates 64 extending from its bottom to within a short distance of its to and at its rear vertical edges with rearwardly-extending plates 65 which extend substantially from the top of the duct 63 to within a short distance of the bottom of this duct.

According to the preferred illustrated con struction the front wall of the duct 63 and the plates, are formed of a single sheet, and each end wall of the duct 63 and the adjacent plate 65 of a single sheet, the sheet forming the front wall 0 the duct 63 and the plates 64 being folded to form grooves 64 into which'the forward edges of the end walls of the duct 63 extend, grooves 65 being similarly formed in the sheets forming the end walls of the-duct 63 and the plates 65 to receive the vertical edges of the sheet forming the rear wall of the duct 63, the folded material at these joints thus provided being crimped upon the parts embraced thereby and forming closed joints.

The sheet metal forming the front, rear and end walls of the duct 63 extends upwardly above the upper edges of the plates tions of the shell'll as shown.

I The lips 102 extend upwardly through an opening 69 in the plate portion 57 and are bent outwardly and downwardly against the upper surface of the plate portion 57 to clamp the portions of the plate 57 defining the opening 69 tightly between the flanges 101 and lips 102 and make tight joints.

The forward wall of the duct 63 and the plates 64 form the rear wall of the combustion chamber 23, the side walls, front wall and top of which are formed of portions of the inner shell 11 as shown, the hot-air duct 63 opening into the space above the top portion 57 of the shell through the opening 69.

The openings represented at 70 and provided at the upper ends of the plates 64 afford communication between the combustion chamber 23 and gas flues 71 formedof portions of the side walls 55, the rear wa l 56,

the end walls of duct 63 and the plan-:5 64

and 65, these fines opening at their lower ends through the openings 72 at the lower ends of the plate 65, into a gas flue 73 bounded by the plates 65, the rear wall of the duct 63 and the rear wall 56 of the shell 11, the

. wall 56 having an outlet 74 for the gas shown as communicating with a stack 75 which extends through the rear wall of the outer shell 8.

lit will be understood from the foregoing that in the operation of the heater the hot gases generated by the burner apparatus 10 rise in the combustion chamber 23, thence discharge through the openings 70 into the fines 71 through which they pass downwardly to the openings 72 for discharge into the fiue'73 through which they rise and escape to the stack, thereby presenting a relatively long passage for the gases which in flowing over the large area surfaces of the air duct 63 heat the air rising through the duct 63 for discharge at the top of the heater, the construction being such, as described, that a high rate of heat interchange between the air rising in the duct 63and the heated gases contacting with the walls thereof is effected, with relative freedom of gas flow through the heater and resultant low stack temperatures.

The air duct 63, as shown, is relatively long and narrow in plan affording relatively therethrough, while of a particularly desirable shape for a heater of the general shape in plan as shown in the drawings.

by merely adjusting the base.

It will also be understood that in the operation of the heater, the surrounding walls of the shell 11 become heated and thus induce upward flow of air through the tines 59,

and 61 and discharge of this heated air through the top of the heater.

valves and in sodoing preheating the air before it reaches the burners, with the manifest advantage.

The use of the single air duct 63 not onl improves the'circulation of the air throug the heater and givesimproved heat-absorption results, but in combination with the wall forming plate portions 64 and provided thereon as stated, reduces the number of joints required in forming the air "and gas ducts in the heater and makes possible the obtaining of great efliciency of the heater by a comparatively simple mechanical construction.

Furthermore. it is to be noted that the base 6 serves as a support not only for the burner apparatus but also for the various parts of the heater shown superposed thereon, whereby the adjustment of the burner apparatus, as for example to insure the level condition thereof may be effected, while maintaining the several parts of the heater associated therewith in their proper relative positions,

In his connection it is preferred that the several legs 7 be connected with the base for relative adjustment of these parts, it being preferred that the construction shown he provided and involving for each leg a cylindrical anchor'element 76 secured to the floor 77 as by a screw 78 and extending-upwardly into the hollow leg 7, the anchor element 76 containing an endless peripheral groove 79 into which a set screw 80 carried by the leg 7 extends, thereby forming an anchorage for the leg 7 holding it to the floor. The leg 7 isrrotatable on the anchor element 76 and engages at a threaded opening 81 in a web 82 within the leg, the

lower threaded end 83 of a rod 84 extending upwardly through the top of the leg and rigidly secured at its upper threaded end 85 in a threaded opening '86 in the adjacent arm 17. Thus by rotating the leg 7, the rod 84 being stationary, the leg is adjusted relative to the base 6 and therebv the latter may be "caused to be supported for positioning the burner apparatus in the desired level condition, it being noted that the set screw 80 not only holds the leg to the anchoring element 76 and thus in anchored condition to the floor, but prevents, by the tightening of this set screw, accidental disturbance .of the adjustment of the leg relative to the base 6.

.The feature of mounting the burner apwith of the wall superstructure thereby greatly reducing the cost of assembling the various parts of the heater.

While we have illustrated and described a particular construction embodying our invention, we do not wish to be understood as intending to limit it thereto as the same may-be variously modified and altered without depart'ng from the spirit of ourinvention. 9

What we claim as new, and'desire to secure by Letters Patent, is:

1. A heater comprising a casing structure having a base member forming a closure for said casing structure and side walls, and oilburner apparatus in said casing, said base member comprising separate sections one oi which is formed with an upwardly ofi'set portion on which the"burner"apparatus is supported and contains an opening below said offset portion and the other of which is in the form of a removable oil-drip pan positioned below said upwardly ofi'set portion and closing said opening and serving to receive oil dripping from the apparatus. I

2. A heater comprising a casing structure having a base member forming a closure for said casing structure and side walls, anvoilburner apparatus in said casing and comprising valve means controlling the flow of oil to the apparatus, said base member comprising separate sections one of which is formed 3. A unit for assembling with a casing to i provide a series of passages comprising a hollow body open at its top and bottom and having a set of plate portions extending therefrom in opposite directions at one face of said body and a second set of plate portions extending in the same direction from said body atits opposite face and angularly relative to said first-referred-to set of plate portions, said first-named set of plate portions and said first-referred-to face of said body being formed of a single sheet folded to form grooves into which edges of the side walls of said hollow body extend and each of said side walls and the adjacent one of said secondnamed set of plate portions being formed of asingle sheet folded to form a groove, the rear face of said body extending at opposite edges into said last-referred-to grooves.

OSCAR C. SCHROEDER. STANLEY PERRY. 

